There are two primary types of strokes, including ischemic and hemorrhagic strokes. Ischemic strokes occur when there is a paucity of blood supply to the brain, which depletes oxygen and key nutrients necessary for the brain to function. This leads to the degradation of brain cells, which can have significant long-term consequences on an individual. In the meantime, hemorrhagic strokes occur when there is a brain hemorrhage, or in other terms, blood vessels in the brain break, causing an accumulation of blood in the brain that increases pressure and leads to brain cell damage as well. To identify whether you or someone around you has a stroke, look for the following symptoms: Inability to comprehend speech Sudden numbness in body parts (including the inability to raise both of one's arms or mouth to stay firm) Reduced, double, or blurred vision Headache, vomiting, or dizziness Reduced coordination (difficulty in walking properly) When you notice these initial symptoms, you must remember the acronym FAST. F stands for face. Check if the person's face is drooping or paralyzed. A stands for arms. Check if the person can still move both arms. S stands for speech. Is the person able to repeat a phrase word-by-word without slurring? T stands for time. If you notice any of the symptoms above, you must prioritize acting quickly by calling for emergency medical guidance. There are various underlying causes of stroke and risk factors that can increase the possibility of its occurrence. For ischemic strokes---the most frequent type of stroke---, fatty deposits, blood clots, or debris blood vessels accumulate in the brain's blood vessels, leading to the constriction of blood flow through these vessels (a condition referred to as ischemia, and hence, the name ischemic stroke). Since risk factors like obesity, having a sedentary lifestyle, excess drinking, or consumption of illegal drugs can all lead to the narrowing or blocking of blood vessels, individuals must be wary of what they consume and are exposed to. Hemorrhagic strokes are typically caused by high blood pressure, head trauma, protein deposits in blood vessels, or ischemic strokes. Hence, individuals must manage hypertension with medicine, a diet without excess cholesterol or saturated fat, and nearly 30 minutes of physical activity every day. Current medications for strokes include anti-platelet drugs and anticoagulants. To start, platelets are types of cells that are responsible for blood clot formation. Hence, anti-platelet drugs like Plavix (for individuals who have experienced minor strokes) or Ticagrelor are effective in decreasing the chance of blood clot formation in blood vessels. Likewise, anticoagulants, also called blood-thinning medications, prevent blood clotting. The most common anticoagulants are Heparin, which is often used as a quickly effective response in hospitals, and warfarin with a slower yet powerful effect. I hope this article taught you more about the mechanism behind strokes, along with symptoms, causes, potential preventative measures, and medications for stroke. By understanding the initial signs of strokes and how to act accordingly, you may one day be able to help a fellow human in need, which I believe is the ultimate goal of medicine. Source: https://www.mayoclinic.org/diseases-conditions/stroke/symptoms-causes/syc-20350113 Cover photo via Hamilton Health Sciences © 2025 Kaylyn K. | All rights reserved  Originally published at themedtales.com

This excerpt attempts to inform readers on how stem cells are being used to advance genetic engineering, along with addressing some of the current controversies regarding this research. Stem cells are uncategorized cells that can infinitely divide themselves and have the potential to become other kinds of cells. They can be found in the brain, bone marrow, skeletal muscles, and embryo. Mentioning embryos, there are two main types of stem cells. The first is embryonic stem cells. They are created through a process called in vitro fertilization, which, to give you a brief overview, is a process that involves using the totipotent stem cells from an embryo for surgical purposes. Totipotent means that they have total potential to become any other kind of cell. The other predominant cell type is adult stem cells; these are the ones that our body uses when, for example, you get your arm burnt and need extra skin cells to replace the damaged ones. As mentioned previously, in vitro fertilization is the process of creating embryos in the laboratory. To walk you through the process, the sperm fertilizes the egg, and this forms a single, synthesis cell known as the zygote, shown in the image below. Through mitosis, this zygote divides until it forms a blastocyst, which is a cluster of 150-200 cells. In the blastocyst, there is the inner cell mass consisting of totipotent stem cells. These can be taken out through electricity or chemicals. Similar to in vitro fertilization, therapeutic cloning is another way of using embryonic stem cells. It involves taking an egg from a donor and a skin cell from a patient. Then, the doctor/surgeon/scientist can remove the DNA of the egg and replace it with the DNA of the patient’s skin cells. Through chemicals, the embryo dies, but the stem cells survive, which is then inserted into the patient. Earnest McCulloch and James Till were the true pioneers of stem cell research. In the 1960s, they discovered how hematopoietic (blood-making) stem cells were able to convert into any other kind of blood cell. But President Bush, through the Stem Cell Enhancement Act of 2005, banned the funding of cell research by the government. In 2009, this ban was lifted by President Obama. But why did these scientists want to learn more about stem cell therapy? First, stem cell therapy can treat cardiovascular and blood-related diseases by replacing the cells damaged by the disease with new stem cells. One day, this might also help regenerate organs, which is critical since there are not a lot of organ transplants readily available in proportion to those who are sick. Yet, there are many ethical implications to doing this. First, both vitro-fertilization and therapeutic cloning involve destroying a human blastocyst. So, research and development institutions face the difficult question, “When does life begin?” If, according to religion, life begins from conception, then using embryonic stem cells is essentially murder. But is it okay because these embryos are made in the laboratory and are not inserted into a woman’s body? Some pro-lifers support this since they believe conception is also relative to where development occurs. Hence, at the end of the day, religion and politics play a strong influence in answering this question. This is why institutions must provide informed consent and any information about the donors must be kept strictly confidential. To conclude, how does stem cell therapy change our world? First, there is a correlation between aging and the number of stem cells in the body, so this can potentially lead to cures to delay aging. Second, there might no longer be a need for organ donors anymore. But ultimately, stem cell research will influence our generation and those who come after us. It can provide treatments for the diseases that 100 million Americans currently have. So, today, I invite you to look briefly into stem cell research. After all, it could impact you, your family, or your future children one day. Works Cited Brazier, Yvette. “Stem Cells: Sources, Types, and Uses.” MedicalaNewsToday , 19 Oct. 2018, www.medicalnewstoday.com/articles/323343#donating-and-harvesting . Accessed 23 Mar. 2024. Harvard University. “Stem Cells: A Brief History and Outlook.” Science in the News , 3 Jan. 2014, sitn.hms.harvard.edu/flash/2014/stem-cells-a-brief-history-and-outlook-2/ . Accessed 23 Mar. 2024. Lo, Bernard, and Lindsay Parham. “Ethical Issues in Stem Cell Research.” Endocrine Reviews , vol. 30, no. 3, 14 Apr. 2009, pp. 204–213, www.ncbi.nlm.nih.gov/pmc/articles/PMC2726839/ , https://doi.org/10.1210/er.2008-0031 . Accessed 23 Mar. 2024. Moradi, Mike. “Why Stem Cells Could Be the Medical Innovation of the Century.” World Economic Forum , 16 Jan. 2020, www.weforum.org/agenda/2020/01/how-will-stem-cells-impact-the-future-of-medicine/ . Accessed 23 Mar. 2024. White, Deborah. “Arguments for and against Embryonic Stem Cell Research.” ThoughtCo , 24 May 2019, www.thoughtco.com/pros-cons-of-embryonic-stem-cell-research-3325609 . Accessed 23 Mar. 2024. Image Citation Dahal, Prashant. “Zygote- Definition, Examples, Formation, Development, Challenges.” Microbe Notes , 3 Aug. 2023, microbenotes.com/zygote/ . Accessed 23 Mar. 2024. © 2024 Kaylyn K. | All rights reserved  Originally published at themedtales.com

This easy-to-understand study guide strives to give a brief overview of how proteins are produced. OVERVIEW OF PROCESS mRNA (messenger RNA) is produced. The mRNA strand leaves the nucleus and heads for the ribosome/cytoplasm area. The tRNA strands (connected to amino acids) match with the mRNA strand. A long amino-acid chain is produced. Proteins can be formed with these amino-acid chains (AKA polypeptides). KEY TERMS Enzyme: a kind of protein that expedites chemical processes Most enzymes end with the phrase "ase" Example) RNA polymerase, DNA polymerase DNA: deoxyribonucleic acid The genetic information that most of our cells contain in the nucleus Double-helix structure Gene: segments of the DNA that produce a specific protein and, in turn, determine a specific trait Allele: different kinds of genes Example) One gene can code for hair color (broader term), but one allele would code for brown hair (more specific). RNA: ribonucleic acid Typically single-stranded Different kinds) mRNA, tRNA, etc. Protein synthesis: the process in which proteins are produced Central Dogma: a term referring to how information goes from transcription (DNA --> RNA) to translation (RNA --> Amino Acids) Protein: molecules that help organisms survive Amino Acids: the material that the protein is made up of There are 9 essential amino acids that humans need to survive. Promoter: the marker that indicates where the RNA polymerase should attach to the DNA strand Terminator: the marker that indicates where the RNA polymerase should detach from the DNA strand Codons: a system for counting the nucleotide sequences in groups of 3 (triplets) Nucleotide: the material in which nucleic strands are made up of (both DNA and RNA have) DNA: Contains 1 nitrogenous base, 1 deoxyribose sugar, and 1 phosphate RNA: same as DNA, except that it contains a ribose sugar, instead of a deoxyribose one Ribosome: an organelle where protein synthesis takes place Made up of rRNA (ribosomal RNA) Has three sites for the tRNAs to briefly stay and pass on the amino acids Sites A, P, E --> The tRNAs rotate their locations in that respective order FIRST STEP: Transcription KAYLYN TIP #1 Transcript often refers to the written documents of a video, so you can remember transcription as changing one form of something into another form . In this case, DNA turns into mRNA. Location: nucleus DNA is unzipped by the RNA polymerase at the promoter. The RNA polymerase "reads" the DNA's bases and creates complementary pairs. Typically, adenine goes with thymine, but this time, thymine is replaced with a base pair called uracil. Guanine goes with cytosine (and vice versa) This forms an mRNA (messenger RNA) strand. It is then edited and sent out of the nucleus and into the cytoplasm. SECOND STEP: Translation KAYLYN TIP #2 It's all in the name! Translating a speech from one language to another is like translating RNA nucleotides into a chain of amino acids. Location: Cytoplasm/Ribosome The cytoplasm consists of tRNA (transfer RNA) strands that each have an amino acid attached to it. The tRNA strands "read" the mRNA's bases in threes (codons) and bind to the mRNA if they are complementary. EXTRA INFO: Each tRNA strand is called an "anticodon". Translation first starts at the start codon. While the tRNA strand leaves to find another matching codon, the tRNA will leave the amino acids behind, gradually making a long chain of amino acids. This continues until the stop codon indicates that the polypeptide (chain of amino acids) is complete. [NOTE: The following explanation is extremely simplified.] The final step differs for every kind of protein, but it typically requires multiple polypeptides to bond and fold into the shape of a specific kind of protein. Here are the sources I used to make this study guide. Feel free to look at these resources for more information! https://youtu.be/oefAI2x2CQM?feature=shared https://medlineplus.gov/ency/article/002222.htm https://my.clevelandclinic.org/health/articles/21532-enzymes https://www.khanacademy.org/science/ap-biology/heredity/mendelian-genetics-ap/v/alleles-and-genes#:~:text=Genes%20and%20alleles%2C%20two%20fundamental,traits%20such%20as%20eye%20color . https://www.khanacademy.org/science/biology/gene-expression-central-dogma/translation-polypeptides/a/trna-and-ribosomes https://www.genome.gov/genetics-glossary/Nucleotide https://medlineplus.gov/genetics/understanding/howgeneswork/protein/ https://www.cancer.gov/publications/dictionaries/genetics-dictionary/def/nucleotide https://youtu.be/hok2hyED9go?feature=shared Image Credits: https://stock.adobe.com/kr/search?k=dna+transcription https://studymind.co.uk/notes/transfer-rna/ © 2024 Kaylyn K. | All rights reserved  Originally published at themedtales.com